Let's not make up numbers... Income tax is high here (not 70%) but you know, you get what you pay for. If you're American the 30% rule kicks in as long as you are here on a dutch american treaty visa or sponsored by a company. Any American can start a company here and get a 1 year visa. That's a pretty low barrier or entry compared to most countries. Corporate tax is also incredibly low, with a ton of benefits for the first 3 years you are a b.v. (dutch corp)
I don't think it's about hitting a magical number as much as it's about hitting consistent numbers. 1 million over time is a great goal but is it worth as much as consistently hitting 25k everyday for a month or two? Benchmarks are meaningful and will absolutely drive a project but in the end consistency sells.